Auditory hallucinations

Auditory hallucinations are the perception of sounds — voices, music, tones, or ambient noise — without any external source.

As a drug effect they are acute and dose-dependent, fading as the substance wears off, distinguishing them from the persistent auditory hallucinations of a psychiatric condition. They range from faint tonal shimmer at the edge of hearing to vivid, fully-formed voices indistinguishable from the real world.

They are an uncommon effect, occurring most reliably at high doses. They are most commonly induced under psychedelics such as LSD, psilocybin mushrooms, and 1B-LSD, and under dissociatives such as ketamine, dextromethorphan, and 3-MeO-PCP. They also appear at high doses under stimulants like 6-APB, 3-MMC, and A-PHP, and under certain depressants — notably eszopiclone and zolpidem — where they can emerge even at low doses.

Auditory hallucinations are felt as sound arriving with full perceptual conviction: voices may carry speech or emotion, tones shift in pitch or loop without end, and ordinary sounds — traffic, a distant conversation — can be perceived as directed messages or strange distortions.

The effect is often self-amplifying: attending to a faint sound sharpens focus in a way that makes further sounds easier to misread. At high doses under dissociatives, the hallucinated soundscape can become fully immersive and difficult to distinguish from waking reality.

Auditory hallucinations arise through different pathways depending on the drug class:

• Psychedelics — act on 5-HT2A receptors, amplifying thalamocortical noise until spontaneous auditory-cortex activity crosses into perception.
• Dissociatives — block NMDA receptors, disrupting the predictive-coding circuits that normally suppress internally generated sound.
• Stimulants — at high doses, dopaminergic overactivation produces auditory misperceptions and frank hallucinations.
• Depressants — certain agents, particularly z-drugs, trigger auditory experiences at sleep onset and offset states.

How much each pathway contributes in a given case is not fully understood.

Who experiences it, and how strongly, varies widely. Dose is the primary driver — auditory hallucinations are rare at low doses and become more probable as dose rises. Set and setting shape their character: a quiet, dark environment tends to amplify internal sound, while hypervigilance can make ambient noise feel purposeful.

People with a prior history of psychosis or strong auditory sensitivity are more vulnerable, especially under psychedelics and stimulants. A calm, familiar setting and a grounded mindset reduce the likelihood.